Furukawa FRD has developed the Dual-Damper System, a first in the industry. For maximum energy transfer, active DDS minimizes the return of shock waves by keeping the bit firmly against the rock at all times during drilling. It also minimizes percussion energy loss, and by optimizing the overall feed force, greatly improves the life of drilling accessories. Active DDS (U.S. Patent No. 5,896,937).
The drifter’s wedge type piston allows for greater impact efficiency.